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ST7LCRE4U1/XXX Fiches technique(PDF) 16 Page - STMicroelectronics

No de pièce ST7LCRE4U1/XXX
Description  Full-speed USB MCU with smartcard interface
PDF  29 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7LCRE4U1/XXX Fiches technique(HTML) 16 Page - STMicroelectronics

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4.4.3
Crystal resonator oscillators
The ST7 internal clock is supplied with one Crystal resonator oscillator. All the information
given in this paragraph are based on characterization results with specified typical external
components. In the application, the resonator and the load capacitors have to be placed as
close as possible to the oscillator pins in order to minimize output distortion and start-up
stabilization time. Refer to the crystal resonator manufacturer for more details (frequency,
package, accuracy...).
Table 12.
Crystal resonator characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fOSC
Oscillator Frequency(1)
MP: Medium power oscillator
4
MHz
RF
Feedback resistor
90
150
k
Ω
CL1
CL2
Recommended load
capacitances versus
equivalent serial resistance
of the crystal resonator
(RS)
See Table 14
(MP oscillator)
22
56
pF
i2
OSCOUT driving current
VDD=5V
VIN=VSS
(MP oscillator)
1.5
3.5
mA
1.
The oscillator selection can be optimized in terms of supply current using an high quality resonator with small RS value.
Contact crystal resonator manufacturer for more details.
Table 13.
Typical crystal resonator characteristics
Oscillator
Reference
Freq.
Characteristic(1)
CL1
(pF)
CL2
(pF)
tSU(osc)
(ms)(2)
MP
JAUCH
SS3-400-30-
30/30
4MHz
∆f
OSC=[±30ppm25°C,±30ppm
∆Ta] (Typ)
RS=60Ω
33
33
7~10
1.
Resonator characteristics given by the crystal resonator manufacturer.
2.
tSU(OSC) is the typical oscillator start-up time measured between VDD = 2.8 V and the fetch of the first instruction (with a
quick VDD ramp-up from 0 to 5 V (<50 µs).
Table 14.
Recommended values for 4 MHz crystal resonator
Symbol
Min
Typ
Max
RSMAX
(1)
20
Ω
25
Ω
70
Ω
COSCIN
56 pF
47 pF
22 pF
COSCOUT
56 pF
47 pF
22 pF
1.
RSMAX is the equivalent serial resistor of the crystal (see crystal specification).



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